[kmail2] [Bug 410483] New: Filter with custom headers doesn't match

[Kamil]

https://bugs.kde.org/show_bug.cgi?id=410483

            Bug ID: 410483
           Summary: Filter with custom headers doesn't match
           Product: kmail2
           Version: 5.11.3
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: commands and actions
          Assignee: kdepim-bugs at kde.org
          Reporter: kamil.kuramshin at tatar.ru
  Target Milestone: ---

Want to create a filter to match some custom header in messages.
For example, X-MS-Exchange-Security - is a header inserted by Mail Server it
has a specific value = beabed97-c8f6-4dff-a2a2-172912d88bc1. I have created a
filter for this header:
"X-MS-Exchange-Security" <contains> "beabed97-c8f6-4dff-a2a2-172912d88bc1"
But it never match even if one apply it to specific message manually.
Same thing if filter looks like:
"<any header>" <contains> "beabed97-c8f6-4dff-a2a2-172912d88bc1"
And selected filter action is not performed.

Only if filter set to whole message it will start matching:
"<message>" <contains> "beabed97-c8f6-4dff-a2a2-172912d88bc1"

STEPS TO REPRODUCE
1. Create a filter with _custom header_ that should match specific string
2. Got a message with _custom header_ you want to filter by.
3. Apply filter to message from 2. 

OBSERVED RESULT
>From filter journal:

[15:22:53] 0 = "<X-MS-Exchange-Security>" <contains>
"beabed97-c8f6-4dff-a2a2-172912d88bc1" ()
[15:36:54] 0 = "<any header>" <contains> "beabed97-c8f6-4dff-a2a2-172912d88bc1"

EXPECTED RESULT
[15:22:53] 1 = "<X-MS-Exchange-Security>" <contains>
"beabed97-c8f6-4dff-a2a2-172912d88bc1" ()
[15:36:54] 1 = "<any header>" <contains> "beabed97-c8f6-4dff-a2a2-172912d88bc1"
Filter should match and action should be executed.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux 
KDE Plasma Version: plasma-desktop 5.16.4-1
KDE Frameworks Version: plasma-framework 5.60.0-1
Qt Version: qt5-base 5.13.0-7

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